condition mean min max ZT0-3 36.031175000000005 30.855600000000003 41.20675 ZT4-7 25.629649999999998 25.629649999999998 25.629649999999998 ZT8-11 28.75645 28.75645 28.75645 ZT12-15 0 0 0 ZT16-19 32.1809 32.1809 32.1809 ZT20-23 26.5581 26.5581 26.5581